[单项选择]

Text 4
Most economists in the United States seem excited by the spell of the free market. Consequently, nothing seems good or normal that does not accord with the requirements of the free market. A price that is determined by the seller or, for that matter, established by anyone other than the aggregate of consumers seems harmful. Accordingly, it requires a major act of will to think of price-fixing (the determination of prices by the seller) as both "normal" and having a valuable economic function. In fact, price-fixing is normal in all industrialized societies because the industrial system itself provides, as an effortless consequence of its own development, the price-fixing that it requires. Modern industrial planning requires and rewards great size. Hence, a comparatively small number of large firms will be competing for the same group of consumers. That each large firmwill act with consideration of its own needs and thus avoid selling its products fo
A. predicting the consequences of a practice.
B. criticizing a point of view.
C. calling attention to recent discoveries.
D. summarizing conflicting opinions.

Text 4
Most economists in the United States seem excited by the spell of the free market. Consequently, nothing seems good or normal that does not accord with the requirements of the free market. A price that is determined by the seller or, for that matter, established by anyone other than the aggregate of consumers seems harmful. Accordingly, it requires a major act of will to think of price-fixing (the determination of prices by the seller) as both "normal" and having a valuable economic function. In fact, price-fixing is normal in all industrialized societies because the industrial system itself provides, as an effortless consequence of its own development, the price-fixing that it requires. Modern industrial planning requires and rewards great size. Hence, a comparatively small number of large firms will be competing for the same group of consumers. That each large firmwill act with consideration of its own needs and thus avoid selling its products fo
A. Soviet firms show greater profit.
B. Soviet firms have less control over the free market.
C. Soviet firms are able to adjust to technological advances.
D. Soviet firms have some authority to fix prices.

Text 3
Most growing plants contain much more water than all other materials combined. C. R. Bames has suggested that it is .as proper to term the plant a water structure as to call a house composed mainly of brick a brick building. Certainly it is that all essential processes of plant growth and development occur in water. The mineral elements from the soil that are usable by the plant must be dissolved in the. soil solution before they can be taken into the root. They are carried to all parts of the growing plants and are built into essential plant materials while in a dissolved state.
The carbon dioxide (CO₂) from the air may enter the leaf as a gas but is dissolved in water in the leaf before it is combined with a part of the water to form simple sugars -- the base material from which the plant body is mainly built. Actively growing plant parts are generally 75 to 90 percent water. Structural parts of plants, such as wood
A. The mineral elements will not be absorbed by the plant unless they are dissolved in its root
B. The woody stems contain more' water than the leaves
C. Air existing around the leaf is found to be saturated
D. Only part of the carbon dioxide in the plant is synthesized

Text 3
Most young people enjoy some form of physical activity. It may be walking, cycling or swimming, or in winter, skating or skiing; it may be a game of some kind: football, hockey, golf, or tennis; it may be mountaineering.
Those who have a passion for climbing high and difficult mountains are often looked upon with astonishment. Why are men and women willing to suffer cold and hardship, and to take risks on high mountains This astonishment is caused probably by the difference between mountaineering and other forms of activity to which men give their leisure.
Mountaineering is a sport and not a game. There are no man - made rules, as there are for such games as golf and football. There are, of course, rules of a different kind which it would be dangerous to ignore, but it is this freedom from man- made rules that makes mountaineering attractive to many people. Those who climb mountains are free to use their own methods.
If we compare mou
A. hardship
B. cold
C. physical risk
D. all of the above